After discussing with Alfonso this morning, your syslog definitely shows signs of the ofono bug mentioned above in comment #6. I asked Alfonso to mark this as Critical/rtm14 as when this bug is hit, the modem becomes unresponsive until the phone is restarted ( technically an ofono restart would work, but a non-technical user would have no idea how to do this ).
After discussing with Alfonso this morning, your syslog definitely shows signs of the ofono bug mentioned above in comment #6. I asked Alfonso to mark this as Critical/rtm14 as when this bug is hit, the modem becomes unresponsive until the phone is restarted ( technically an ofono restart would work, but a non-technical user would have no idea how to do this ).